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US 7,127,481 B1Granted
Movable tap finite impulse response filter
AssigneeMarvell International Ltd.
InventorYat-Tung Lam
Life of this patent
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Abstract
Adaptive Finite Impulse Response Filter control includes structure and steps for receiving an input signal, filtering the input signal with an FIR filter having a plurality of filter stages, and delaying application of the input signal to at least one of said filter stages with respect to the other filter stages to skip filtering a portion of the input signal.
Claims7
FIR filter apparatus comprising:
- an input for receiving an input signal;
- an FIR filter comprising a plurality of filter stages,
- wherein the plurality of filter stages comprises a first plurality of stages and a second plurality of stages,
- the first plurality of stages receiving a predetermined first portion of the input signal;
- and
- a delay coupled between two of said plurality of filter stages to delay application of the input signal to at least one of said filter stages to skip filtering a portion of the input signal,
- said delay providing a variable second portion of the input signal to said second plurality of stages.
4 more elements
FIR filter apparatus comprising:
- a signal input receiving an input signal;
- a first block of filter stages having a respective first plurality of taps which receive a respective first plurality of weighting coefficients, for filtering a first portion of the input signal in accordance with the first plurality of weighting coefficients;
- a second block of filter stages having a respective second plurality of taps which receive a respective second plurality of weighting coefficients, for filtering a second portion of the input signal in accordance with the second plurality of weighting coefficients;
- and
- a delay which variably delays application of the second portion of the input signal to the second block of filter stages with respect to the first portion of the input signal.
2 more elements
FIR filter apparatus comprising:
- signal input means for receiving an input signal;
- a first block of filter means, having a respective first plurality of taps which receive a respective first plurality of weighting coefficients, for filtering a first portion of the input signal in accordance with the first plurality of weighting coefficients;
- a second block of filter means, having a respective second plurality of taps which receive a respective second plurality of weighting coefficients, for filtering a second portion of the input signal in accordance with the second plurality of weighting coefficients;
- and
- delay means for adjustably delaying application of the second portion of the input signal to the second block of filter means with respect to the first portion of the input signal.
2 more elements
A method of controlling an FIR filter comprising the steps of:
- receiving an input signal;
- filtering a first portion of the input signal with a first block of filter stages having a respective first plurality of taps which receive a respective first plurality of weighting coefficients, the first portion of the input signal being filtered in accordance with the first plurality of weighting coefficients;
- filtering a second portion of the input signal with a second block of filter stages having a respective second plurality of taps which receive a respective second plurality of weighting coefficients, the second portion of the input signal being filtered in accordance with the second plurality of weighting coefficients;
- and
- adjustably delaying application of the second portion of the input signal to the second block of filter stages with respect to the first portion of the input signal.
2 more elements
Dependencies are inferred from the claim text.